ML19206B281
| ML19206B281 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/02/1978 |
| From: | Herbein J Metropolitan Edison Co |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| TASK-TF, TASK-TMR GQL-0359, GQL-359, NUDOCS 7905080315 | |
| Download: ML19206B281 (3) | |
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METHOPOLI FAN EDISON COMPANY PCST OFFICE BOX 542 REACING PENNSVLVANI A 19603 PHcNE 215 - 929-260'
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'"hree Mile Island :!uclear St1tica Unit 2 (CC-2)
Cperating License :Ic. OPE-73 uceket,.,c.
e,u-ec License Asa-A-a-+
Sequest : c.1 Enclosed please find a copy of a 2 etter issued by Sabecek and 'dilecx at the request of Metropolitan Edisen Cenpany.
~his letter s,-
-izes the Babecek and "iilecx Safety Analysis cccc arning the above-referenced license Amendment P.eques t.
his Eabecek and 'Jilecx letter is submitted here'.ith in support of the above-nentioned amend:ent request.
A130, please be advised that in order to eliminate ther 1'
stresses, the hydrostatic test requested in the Subject Asen cent T.equest vill be perferred at essentially thrnal equilibriu=.
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.. 3 ffice of Inspection L Inforcement U. 3. : uclear Regula: cry Cc sissicr-na ~4 4..s-..,.,...
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ce VIA TE.Ec0PY 02bCOCk&Wi}COX Power Generation Grcup P.O. Box 1260. Lynentu. g Va. 24 505 Te'e:Mene: (204) 38c-5111 February 24, 1978 Mr. Courtney S=ythe Metropolitan Edisen Cc=pany P. O. Box 542 Reading, Penna.
19603
Subject:
Three Mile Island Nuclear Station, Unit #2 INSERVICE LEAK TEST
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Dear Sir:
.m-Mt..Vernon_Cocponent Engineering has reviewed the develop =ent'of th'eyessure -
..:..._..-a temperature li=itations for TMI-2 and suggests that they =ay be =adif;ied for
- the initial irservice leak' test.
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The NSS pressure te=perature limits are established on the basis of the closure.
head to head flange juncture, reactor vessel outlet nozzle and core. belt '. tne.
The closure head area controls low pressure te=perature relationships due to the -
stresses i= posed by bolt preloading, and the nozzle or belt line controls high pressure conditiona due to high pressure stresses and irradiation damage, respectively.
For preservice hydrostatic testing and the first few years of life the closure head and outlet nozzle control since there is no irradiation da= age.
The temperature require =ents for the preservice hydro (3125psO were established assuming a 1" flaw at both of the critical locations.
This smaller flaw is justified in light of the vessel being fabricated and inspected in accordance with Section III requirements and the lack of no significant fatigue cycling since the vessel has been non-destructively exa=ined.
For the initial inservice leak test, it is appropriate to continue to use the s= aller reference flaws, but a safety factor of 1.5 on pri=ary stresses is necessary to comply with 10CFR50 App. G.
This condition has been analyzed and the stress intensities calculated at 99.7 KSI / IN for the 2300 psi are K}e=.
closure head and K. = 98.7 / IN for the outlet noz:
Using the K!a curve, then a ter ceratureif T-RT,,
= '.20 F is required for compliance with the regu~
lations.
For TMI-2, in acecrdance _
A" Topical Report 10046, the assumed RTy for fer;;ings is 60 F Therefore..:Se nini=u: cetal temperature required f6'r'2300 m i is 130 F if no si;;nificar.: thermal stresses are present.
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e Babccck&Wilcox Mr. Courtney Snythe Me:: poli:an Edison Centany Subj ect: INSERVICI LIAR EST February 24, 1973 he lever 11:1: of tenpera:ure required a: 625 psi is es:ab'i.shed by the closure head and is T-RT,JDT = 100*F.
Therefore, it is fel: tha: a sufficien: conservatism is ac;.ieved if the ini:ial inservice leak test is perfor ed in the sa=e arner as the preservice hyd-a-
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static test, i.e., hold :he syste= belev 625 psi until netal te=peratures exceed 2- _ -
130 ?. and then allow pressuri:stien :o inservice leak pressure (less -than 2200 psi). The heanup is also controlled :o induce nini=u= ther-'1 stresses in tr
_ the system.
you have any ec==ents or questicus en the abcve, please let us hear frc::t -
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Yours very trufy,
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Senior Project Manager fl.L.
By:
L. R. Plecke Project 'fanager r Lv. t.. n.
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